My Home Lab Server with 20 Cores / 40 Threads and 128 GB Memory

Re:My Home Lab Server with 20 Cores / 40 Threads and 128 GB ... by parsimo2010 on Tuesday August 13, 2019 @10:15PM (#20692165)

It seems like the author wasn’t targeting benchmarks exclusively, and comparing the price of a CPU to the price of a whole system isn’t fair. I spent about $2200 on a system that was targeting compute value- I have 4x E7-4890v2 for a total of 60 cores and can get >80000 on multicore geekbench. I also have 512GB of RAM, which I think is more than Ryzen can handle.

I paid $85 per CPU, so while a new Ryzen 9 does make sense for a lot of people with its fast single threaded speed and low power consumption, the old server gear I bought still wins in highly parallel tasks for less money.

Edit for proof of my geekbench score: https://browser.geekbench.com/v4/cpu/13853828 That was before I expanded the RAM, but the score didn’t change with the extra memory.

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Re:My Home Lab Server with 20 Cores / 40 Threads and 128 GB ... by nessunodoro on Tuesday August 13, 2019 @11:43PM (#20692550)

Thanks for this. How are the energy needs/costs?

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Re:My Home Lab Server with 20 Cores / 40 Threads and 128 GB ... by parsimo2010 on Wednesday August 14, 2019 @12:02AM (#20692625)

I haven't measured power consumption with a meter, but each CPU has a TDP of 155 W, so potentially 620 W plus whatever is required to keep the motherboard, RAM, and disks alive. My ballpark guess is 750 W at full load and under 200 W at idle. It runs off a 1600 W power supply, but I suspect that is overkill. It's definitely less power-efficient than a new Ryzen CPU.

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